双选题 已知能使某金属产生光电效应的极限频率为v0,则

题号:11 题型:单选题内容:
A passbook and your ID card are required when you want to ______ or withdraw money in a bank.
选项:
a、deposit
b、 spend
c、 store
d、 invest
题号:12 题型:单选题内容:
Only then ____ the importance of learning English.
选项:
a、had I realized
b、would I realize
c、have I realized
d、did I realize
题号:13 题型:单选题It would be unwise to ______ too much importance to what he sai；
选项:
a、pay
b、 provide
c、 attach
d、 indicate
题号:14 题型:单选题内容:
---What were you doing when Tony phoned you?---I had just finished my work and ______ to take a shower.
选项:
a、had started
b、 started
c、 have started
d、 was starting
题号:15 题型:单选题内容:
After Yang Liwei succeeded in circling the earth,______ our astronauts desire to do is walk in space.
选项:
a、where
b、 what
c、 that
d、 how
题号:16 题型:单选题内容:
All the employees except the manager ______ to work online at home.
选项:
a、encourages
b、 encourage
c、 is encouraged
d、 are encouraged
题号:17 题型:单选题内容:
By 11 o’clock,he will ____ for four hours.
选项:
a、have been studying
b、study
c、will be studying
d、have studying
题号:18 题型:单选题（内容:
Felix is ______ a bunch of red roses by a young girl as he came out of his car in front of a large house outside London.
选项:
a、presented
b、 offered
c、 volunteered
d、 supplied
题号:19 题型:单选题内容:
______ two exams to worry about,I have to work really hard this weeken；
选项:
a、As for
b、 Besides
c、 With
d、 Because of
题号:20 题型:单选题内容:
This statement is ______ various interpretations.
选项:
a、capable for
b、 capable of
c、 competent for
d、 competent of

一道定语从句的单选题,要求有排除其他3个选项的理由.
He stayed there for a long time,during __________ he learned spoken English.
A that B in which C which D which time

乐拥书山 要求：（1）请在答题卡上所选题号后的括号内打“√”。（2）若选题一，先将题目补充完整后再作文。（3）立意自定，文体自选（除诗歌外）。（4）字数在600字以上。（5）文中不得出现真实的地名、校名和人名。

理工远程工科概率统计求答案 第1题 单选题 若事件A与B互斥,且知P(A)=0.6,P(B)=0.2,则P(A
第1题
单选题
若事件A与B互斥,且知P(A)=0.6,P(B)=0.2,则P(A+B)=（ ）.
1.0.68
2.0.92
3.0.4
4.0.8
x05
第2题 x05
单选题
在10件同类型产品中有7件一等品,3件二等品.今从中任取4件,则所取的4件产品中有一件是二等品的概率是（ ）.x05
x05
1.
2.
3.
4.
x05
第3题 x05
单选题
某人对同一目标进行6次独立射击,每次命中率都是0.7.则6次射击中正好命中目标2次的概率是（ ）.x05
x05
1.
0.720.34
2.
3.
4.
0.72
x05
第4题 x05
单选题
已知 ,则P(A+B)=（ ）.
x05
1.0.9
2.0.5
3.0.7
4.1.1
x05
第5题 x05
单选题
袋中有4个白球,8个红球.甲先从中任取一个球取后不放回,再放入二个与所取的球的颜色相反的球.（即取出一个白球放入二个红球,取出一个红球放入二个白球）然后乙从袋中任意取一球,则乙取出的一球是白球的概率是（ ）.x05
x05
1.
2.
3.
4.
x05
第6题 x05
单选题
甲、乙二人同时回答某个问题.甲答对的概率是0.8,乙答对的概率是0.7 .则它是由甲答对的概率是（ ）.x05
x05
1.
2.
3.
4.0.8
x05
第7题 x05
单选题
某射手每发子弹击中目标的概率为0.7 ,今对靶独立重复射击20发子弹,中靶次数 的分布律为：P(X=k)= （ ）x05
x05
1.
2.
3.
4.
,(k=0,1...20)
x05
第8题 x05
单选题
设随机变量X的概率密度为 则常系数A=( ) .
x05
1.
3/4
2.
5/8
3.
3/8
4.
1/4
x05
第9题 x05
单选题
设随机变量X的概率密度是 则X的分布函数是（ ）.x05
x05
1.
2.
3.
4.
x05
第10题 x05
单选题
若随机变量X服从正态分布N（10,4） ,则Y=3X+2服从的分布是（ ）.x05
x05
1.N（30,12）
2.N（30,36）
3.N（32,36）
4.N（32,12）
第2题 x09
单选题
在10件同类型产品中有7件一等品，3件二等品。今从中任取4件，则所取的4件产品中有一件是二等品的概率是（）。

英语的单选题,望亲们给个解答原因.
1.There ______ a class meeting tomorrow morning.The teacher will tell the students smoething important.
A.will have B.is going to have C.is going to be D.are going to have
2.The visitors ______our factory two days ago.
A.got B.reached in C. arrived D.reached
3.This Christams card must______ from Jim.
A.is B.was C.be D.are
4._____ of the txins _____ tall.
A.None is B.None are C.Neither are D.Neither is
5.There ______ an English party in our class on Sunday evening.
A.is going to have Bis going to be
6.Please do not make the radio noisy,______?
A.wlii you B.shall we

速求这些题的答案 求准确
第1题 题目类型：
单选题 题目：The movie star _____ with your sister, didn’t he?
可选答案: 1.was used to dance
x09x09x09x09x09 2.used to dancing
3.used to dance
x09x09x09x09x09 4.was used to dancing
x09x09x09x09x09
x09x09 x09x09

第2题
x09x09x09x09x09 题目类型
单选题
题目：The classroom was almost empty ______ a desk or two. 可选答案:
x09x09x09x09x09x09 1.besides
x09x09x09x09x09 2.except for
x09x09x09x09x09 3. except
x09x09x09x09x09 4.in addition to
x09x09x09x09x09
x09x09 x09x09

第3题
x09x09x09x09x09 题目类型：
x09x09x09x09 单选题
题目：_____ that the left side of the human brain is responsible for logic.
可选答案: 1.It generally is believed
x09x09x09x09x09 2.It is believed generally
3.It is generally believed
4.Generally it is believed
x09x09x09x09x09
第4题
x09x09x09x09x09 题目类型：
x09x09x09x09 单选题
题目：Scientists didn’t know much about lung cancer _____.
可选答案: 1.before long
x09x09x09x09x09 2.until recently
x09x09x09x09x09 3.long before
x09x09x09x09x09 4.in the past few years
x09x09x09x09x09
x09x09
第5题 题目类型：
单选题
题目：_____ his wealth, he is not happy.
可选答案:
x09x09x09x09x09x09 1.Except for
2.In spite of
x09x09x09x09x09 3.Because of
x09x09x09x09x09 4.Besides

第6题题目类型： 单选题 题目：He ______ as though he had never in his life seen me before.
可选答案:
x09x09x09x09x09x09 1.went past me
2.avoided me
3.ignored me
4.went away from me

第7题题目类型； 单选题
题目：A new premier has been ______. 可选答案: 1.determine 2.appointed
x09x09x09x09x09 3.admitted
4.assumed
x09x09x09x09x09
x09x09 x09x09

第8题
x09x09x09x09x09 题目类型：
单选题 题目：Jack came to the party with a young woman, whom I ______ to be his girl friend.
可选答案: 1.pretended
2. supposed
x09x09x09x09x09 3.resumed
x09x09x09x09x09 4.granted
x09x09x09x09x09
x09x09 x09x09
第9题 题目类型： 单选题 题目：I took someone else’s book ______ mistake.
可选答案: 1.in
2.for
x09x09x09x09x09 3.with
4.by
x09x09x09x09x09
x09x09 x09x09

第10题
x09x09x09x09x09 题目类型：单选题 题目：At the beginning of this semester, our history professor _____ a list of books for us to read. 可选答案: 1.passed on
2.picked up
3.handed in
4.made out

大学体验英语1作业二
单选题
13.Promotion is ____ upon your record of success.
A.dependent
B.confident
C.reliable
D.dependant
满分：4 分
14.He has ______ old paint from the side of a ship.
A.sliced
B.cut
C.chopped
D.chipped
满分：4 分
15.The woman has three sons and _______ are at school.
A.two of them
B.two of whom
C.two of who
D.two of that
满分：4 分
16.My camera can be _____ to take pictures in cloudy or sunny conditions .
A.treated
B.adjusted
C.adopted
D.remedied
满分：4 分
17.If these shoes are too big ,ask the clerk to bring you a smaller _________
A.suit
B.set
C.one
D.pair
满分：4 分
18.The goals ________ he had fought all his life no longer seemed important to him .
A.after which
B.for which
C.with which
D.at which
满分：4 分
19.This will help to _____ your sunburn.
A.soothe
B.soot
C.sore
D.sop
满分：4 分
20.No professionals may _____ in the amateur tennis tournament
A.participate
B.undertake
C.predict
D.withdraw
满分：4 分
21.The children went there to watch the iron tower ______.
A.to erect
B.be erected
C.erecting
D.being erected
满分：4 分
22.They tried to _____ the old man whose son died in an aircraft.
A.thrill
B.tease
C.console
D.encourage
满分：4 分
23.The school buildings are so arranged as to be ____ of easy enlargement at a future date.
A.capable
B.able
C.interested
D.efficient
满分：4 分
24.The assembling of the parts of a watch must be_____
A.formidable
B.logical
C.precise
D.independent
满分：4 分
25.The boy kept _______ his father for more chocolate,and finally his father _______ .
A.asking for,gave up
B.asking,gave in
C.to ask,gave awa
D.asking,gave of

一节物理双选题,一节化学单选题..
1.科学家们推测,太阳系可能存在着一颗行星,从地球上看,它永远在太阳的背面,人类一直未能发现它.这颗行星绕太阳运动和地球相比一定相同的是( )
A.轨道半径 B向心力
2.下列实验操作一定会造成实验误差的是( )
A在中和热的测定实验中用Ba(OH)2代替NaOH,H2SO4代替HCL
B酸碱中和滴定实验中达到滴定终点后立即读数

题号:11 题型:单选题
内容:
By 11 o’clock,he will ____ for four hours.
选项:
a、have been studying
b、study
c、will be studying
d、have studying
题号:12 题型:单选题
内容:
The patient was so seriously ill that he was ______ the possibility of recovery.
选项:
a、in
b、 out
c、 against
d、 beyond
题号:13 题型:单选题
内容:
In dealing with public relations,we should make every effort to prevent the ______ in personality.
选项:
a、contact
b、 contrast
c、 connection
d、 conflict
题号:14 题型:单选题
内容:
Much importance should be ____ to the conservation of the endangered animals.
选项:
a、attached
b、acquired
c、afforded
d、awarded
题号:15 题型:单选题
内容:
His few personal belongings made it possible for him to move from place to place ____.
选项:
a、at ease
b、on time
c、with ease
d、in time
题号:16 题型:单选题
内容:
Do you have any trouble ____?
选项:
a、getting your car started
b、to get your car to start
c、when you get your car to start
d、to get started your car
题号:17 题型:单选题
内容:
______,he could not lift the weight.
选项:
a、Strong while he was
b、 However strong as he was
c、 Strong as he was
d、 Strong although he was
题号:18 题型:单选题
内容:
Thanksgiving Day is a(n) ______ for family reunion in the U.S.while in China it is Spring Festival.
选项:
a、opportunity
b、 occasion
c、 situation
d、 ceremony
题号:19 题型:单选题
内容:
The great success of this programme has been ______ due to the support given by the local businessmen.
选项:
a、rather
b、 very
c、 quickly
d、 largely
题号:20 题型:单选题
内容:
It would be unwise to ______ too much importance to what he sai；
选项:
a、pay
b、 provide
c、 attach
d、 indicate

关于维生素的问题
单选题
下列说法正确的是（）
A.氨基转移酶所使用的辅酶为PLP
B.乙酰辅酶A羧化酶使用的辅基为生物素
C.转酮酶所使用的辅酶为TPP
D.丙酮酸脱羧酶使用的辅基为TPP
E.以上说法均不对
照我看,ABCD都对...可是这是单选题...所以...我判断,这道题出错了...
有人同意么?同意的话我们就判断这是道错题...答案是ABCD!

求英语解题答案（单选题）2
题号:11 单选题
It was ______ back home after the experiment.
选项:
a、not until midnight did he go b、 until midnight that he didn’t go
c、 not until midnight that he went d、 until midnight when he didn’t go
题号:12 单选题
Do you have any ____ explanation to the matter?
选项:
a、further b、longer c、farther d、far
题号:13 单选题
I finally got the job I dreamed about.Never in all my life _____ so happy.
选项:
a、did I feel b、 I felt c、 I had felt d、 had I felt
题号:14 单选题
They were all ____ that his plan was realistic and so they decided to accept his proposal.
选项:
a、believed b、convinced c、realized d、supposed
题号:15 单选题
The sales manager asked his men to ____ him of everything concerning the sales in time.
选项:
a、inform b、instruct c、intend d、imply
题号:16 单选题
When ____ the education systems of China and Britain,the professor gave a detailed comparison between the two.
选项:
a、being asked to compare b、asked him to compare
c、asking him to compare d、asked to compare
题号:17 单选题
The students expected there ____ more reviewing classes before the final exams.
选项:
a、is b、being c、have been d、to be
题号:18 单选题
Last year John earned ____ his brother,who has a better position in a bigger company.
选项:
a、twice as many as b、twice as much as c、twice as more as d、twice much as
题号:19 单选题
There is ______ hope that she may be cure；
选项:
a、timid b、 powerless c、 faint d、 reliable
题号:20 单选题
We’ll have to find a new _______ of income.
选项:
a、origin b、 resources c、 source d、 idea

英语单选题
37.---If the traffic hadn’t been so heavy,I would have been back by 6 o’clock.
------What a pity Tina________here to see you.
A.is B.was C.had been D.would be
为什么选C,

英语单选题
1,The teacher often helps the students____he thinks are not quick at their studies
A.whom.B.who.C.when D.because
2.Each class Will elect two Students____them on the School Council
A,representing.B,represented
C.to be represented D.to represent
3.The neighbourhood is friendly and convenient .This is___I live here
A,What.B,that.C,how D,why
4.David makes more money than everyone else in the office____
A.combining.B.to combine
C.combined.D.having combined

英语大神,求救啊,急
一、 单选题
1. none of their new products have sold well,_____?
a、haven't they
b、have they
c、hasn't it
d、has it
2. the project _____ by the end of 1998．
a、had been completed
b、had completed
c、has been completed
d、has completed
3. he always keep a dictionary within his _____．
a、reach
b、touch
c、arrival
d、getting
4. both what i say and _____ are right．
a、my thoughts
b、what i think
c、what i thought
d、my thinking
5. tom and mary are going to _____ married when they return from abroad．
a、make
b、take
c、get
d、have
6. do you know the guys who moved in next door? they had another *** and the noise kept me _____ all night．
a、woke
b、awake
c、awaken
d、awaked
7. some other cases,though less dramatic,are equally _____ attention．
a、preserving
b、conserving
c、deserving
d、serving
8. the expression "haste makes waste" does not _____ to reading．
a、affect
b、apply
c、adopt
d、attend
9. _____ driving around all day looking for somewhere to park,why don't you take a bus to town?
a、in spite of
b、rather than
c、in place of
d、other than
10. heavy debts and an old car were _____ his company after the economic crisis．
a、that remained about
b、that left over
c、what remained of
d、what survived from
二、 对话单选题
-- extension 5578, please.
1. -- _____.
a、who are you?
b、one moment, please
c、wait
d、who is that
-- is this 792-3021?
2. -- _____.
a、no
b、wrong number
c、what's your number?
d、no, this is 792-3025
-- could you connect me with the reservation office?
3. -- _____.
a、yes, i can
b、hold the line a minute. i'll connect you
c、excuse me, i am busy
d、it doesn't matter
-- may i see the menu, please?
4. -- _____.
a、this is the menu, sir
b、yes, please go on
c、here you are, sir
d、of course, sir
-- i'd like to make a collect call to 352-3558.
5. -- _____.
a、who shall i say is phoning?
b、and you are?
c、who are you?
d、who is speaking?
-- is that mr. white?
6. -- _____.
a、yes, white speaking
b、yes, go on
c、yes, can i help you?
d、what do you want?
-- would you mind changing seats with me?
7. -- _____.
a、yes, you can
b、of course. i'd like to
c、no, i don't mind
d、certainly, please do
-- operator, could you please get me 812-7986 in san francisco?
8. -- _____.
a、please say it again
b、you can dial yourself
c、you can dial that direct, sir
d、ok
-- sorry, sir. the line is busy. will you hold on?
9. -- _____.
a、for how long?
b、ok, i can wait
c、no, thank you
d、no, i'll call back later
-- wendy, i'd like you to meet my brother sam.
10. -- _____.
a、i am wendy.
b、i heard about you.
c、nice to meet you.
d、ok.
大神们 一次到不了80分题目就又会变了t.t

请大家帮忙做几道大学英语自考单选题.
11-18 单选题
11.Directors Mrs B.Fox,Captain W.L.Hunter,RV.Sharpe The headmaster,Chickfield School,Dear Headmaster,Thank you for your telephone message.We shall be happy to welcome your pupils to the Gardens and Park.The entrance charge is 80p each child,teachers free.Our restaurant will be glad to provide meals at the following low prices:lunch $3.85,tea $1.20 for each child.Our president wishes to say that teachers meal will be supplied free of charge.Our Directors are pleased to act as Guides at a small additional cost of 25p each child (teachers free).Please let me know the number of children coming.Yours truly,T.Falcon (Miss) Secretary 16 June,2000 Miss T.Falcon,Bushey Gardens and Wild Life Park,Dear Miss Falcon,Thank you for your letter of 10 June.I am pleased to say that twenty eight teachers from this school will visit the Gardens and Wild Life Park on Friday,June 28th.I am afraid that the children have decided to save some money.And I am therefore arranging to take them to Paris for the day.Yours truly A.Goodfellow Headmaster What might visitors see in Bushey Gardens and Wild Life Park?
a、Restaurants and meals.
b、Only animals.
c、Plants,trees,wild animals and birds.
d、Presidents,secretaries,directors and the visitors.
12 The students union succeeded in making the computer lab ____ to all the students.
a、asserted
b、alarmed
c、aggressive
d、accessible
13 I feel like ___ to the owner of the house to complain.
a、writing
b、 to write
c、write
d、having written
14 It is necessary for you to keep a good balance and ____ a solid foundation.
a、lie
b、put
c、fund
d、lay
15 The human body is composed of organs,each ____ a definite jot to do.
a、have
b、has
c、 to have
d、having
16 The group had prepared a report on the ________ of management and staff training.
a、case
b、occasion
c、issue
d、occurrence
17 He was killed by the driver of a stolen car who was being hotly _____ by the police.A.B.C.D.
a、pursued
b、issued
c、asked
d、proclaimed
18 A group of engineering seniors huddled,______ the exam due to begin in a few minutes.
a、to discuss
b、discussing
c、discuss
d、discussed

一道英语时态单选题
--do you know whether jim has finished his report?
--no. but he ___ it till early in the morning
A. was writing B. had been writing

英语大侠有活儿给你了
一、单选题1、Could you tell me how to ________ my English?A.alterB.improveC.change2、He tries his best ________.A.and does it wellB.to do it wellC.doing it well3、He looked terrible this morning.He ________ too much last night.A.has drunkB.must have drunkC.should have drunk4、They have the car ________ every three months.A.serviceB.to serviceC.serviced5、The doctor says there is ________ in my headache,but I must have a good rest and take some medicine.A.something seriousB.anything seriousC.nothing serious6、There are many restaurants on ________ sides of the streets.A.eitherB.eachC.both7、Polly ________ in that shop since 1998.A.workedB.has workedC.is working8、We succeeded ________ all the difficulties.A.in spite ofB.becauseC.although9、I am having the TV ________ tomorrow.A.repairedB.repairC.to repair10、I’m going to take an early bus ________ I can get there in time.A.sinceB.becauseC.so that

求英语单选题答案!
2._______this magazine _______ Jan?
A.Is; belonged to B.Does; belong to C.Is; belonged D.Is; belonging
6.-----Peter,hurry up!You ______ on the phone.
------Oh,I ______.Thank you.
A.are being wanted; will come B.are wanted; am coming
C.want,come D.will be wanted; should come
7.The journey around the world took the old sailor nine months,__________ the sailing time was 226 days.
A.of which B.during which C.from which D.for which
8．He suggested that the doctor ___________ at once.
A.be sent for B.was sent for C.would be sent for D.must be sent for
10.----Do you doubt _______ she can run the race?
---- Yes,I doubt _______ she can run against Liu Xiang
A.that; whether B.whether; that C.that; that D.whether; if
12.__________ the lecture going on,the students got more and more interested.
A.With B.While C.During D.As
13.Einstein was _______ a great scientist.He did a lot for human rights and progress.
A.no more than B.not more than C.more than D.as much as
14._______ breaks the law should be punished.
A.Anyone B.Those who C.No matter who D.Anyone who
15.It was not until dark ______ he found that this was the correct way.
A.that B.what C.which D.when
16.Rainforests __________ and burned at such a speed that they will disappear from the earth in the near future.
A.cut B.are cut C.are being cut D.had been cut
17.I’d like to buy a house ---modern,comfortable,and _________ in a quiet neighborhood.
A.in all B.above all C.after all D.at all
18.Those who want to say anything more _____your hand and then_______ to speak.
A.rise; raise B.raise; rise C.raise; raise D.rise; rise
19.----When do you think _____ he_____ the dictionary?
-----Sorry.I have no idea.
A.had; bought B.has; bought C.did; buy D./; bought

一条物理双选题,答案是AB,但我觉得D也对啊,哪位帮我分析下D为什么不对呢?
.如图所示,同心圆表示某点电荷Q所激发的电场的等势面,已知a 、b 两点在同一等势面上,c、d 两点在另一等势面上.甲、乙两个带电粒子以相同的速率,沿不同的方向从同一点a射入电场,在电场中沿不同的轨迹曲线运动,不计重力.则下列说法中正确的是
A.两粒子所带的电荷电性不同
B.甲粒子经过 点的速度大于乙粒子经过
C.两粒子的电势能都是先减小后增大
D.经过 点时,两粒子的动能一定相等

英语选择,单选题,求正确答案.

已知在备选的10道题中甲能大队其中6道,乙能大队其中8道.规定每次考试都从备选题中随机抽出3题进行测试,至少答对2题才能入选.
求甲、乙两人至少有一人入选的概率（设甲、乙两人考试合格的事件分别为A、B）

关于冠词的单选题
____in this place is slow;sometimes you have to wait ten minutes for ____.
A.The service; a service
B.The service; service
C.Service; service
D.Sercice; a service
第二个空为什么没有加不定冠词,service不是可数名词么

简单的单选题
根据下列各组元素的原子顺序,可组成化学是为AB2型化合物,且为原子晶体的是（ ）
A 14和16
B 14和8
C 12和17
D 6和8

一道单选题分析,
The doctor advised that he_____smoking immediately.
A.stops B.stopped C.stop D.will stop
为什么选C,别的为什么不行

英语单选题1,10题 要高手详解（待续）
1、Mr.Wang made up his mind to devote all he could ____ his oral English before going abroad.
A.improve B.to improve
C.improving D.to improving
2、Everything he ____ away from him before he returned to his hometown.
A.took B.had been taken
C.had had been taken D.had taken
3、Before he went abroad,he spent as much time as he ____ English.
A.could learning B.learned
C.to learn D.could learn
4、You can never imagine what great difficulty I have ____ your house.
A.found B.finding C.to find D.for finding
5、The person we spoke to ____ no answer at first.
A.making B.makes C.make D.made
6、The days we have been looking forward to ____ soon.
A.comingB.will come C.cameD.have come
7、Not only ____ the jewelry she ____ been sold for her son’s gambling debts but also her house.
A.is; has B.has; had
C.has; has D./; has
8、____ in thought,he almost ran into the car in front of him.
A.Losing B.Having lost
C.Lost D.To lose
9、The research is so designed that once ____ nothing can be done to change it.
A.begins B.having begun
C.beginning D.begun
10、—What do you think made the woman so upset?
— ____ weight.
A.As she put on B.Put on
C.Putting on D.Because of putting on
DCABD
BCCDC
谁给解释下和你们不一样的题
hebeixiaocao °°吖_尛贝 回答者：75.4.16.* yjsmartyan foryou1437 - 九级
以上都对了9个，谁来解决下最后一题

生物学家认为病毒是生物,其主要理由是【本题为单选题】 A.它是由蛋白质和核酸组成的
B.它能够侵染其他生物
C.它能够在寄主体内复制并产生后代
D.它具有细胞结构

英语中的动词原形、分词形式（单选题区分选项）
i learned to make the spaghetti sauce by watching my mum cook it.这里的Cook为什么不是cooking?

几道英文复合句单选题,
1.【D】- _____ helps others will be helped.
- So,I'm thankful to and try to help ____ has helped us.
A.whoever whomever B.who whoever
C.who whomever D.whoever whoever
2.【D】In the distance there is a hill,_____ stands a white tower.
A,on the top of it B,on the top of there
C,on the top of where D,on the top of which
3.【D】was natural,he married Mary.
A,Which B,That C,This D,As
4.【B】In an open boat,the three men,_____ an engineer,met with a storm on the sea.
A,one of them were B,one of whom was
C,one of them was D,one of whom were

几个定语从句的单选题
1 The reason____he gave for his coming late is ____he wasn't informed of it.
A why,because B that,or C why;that D that,that
2 Our town has been added to these years.It is no longer ___it was 15 years ago,____was poor and untidy.
A what;which B that; which C which;that D that,when
为什么用that 不用why啊

英语好的进来看下吧 ！！！单选题
1.James had only $24._____on earth was he going to get the rest of the money to buy the bicycle that cost at least $90?A.How B.What C.Why D.Who2.______indoors by the heary rain.Floyd(人名) felt the days dull.A. To keep B. Keeping C.Kept D.Keep3.Has Alan shown up yet?----No,not yet.I guess something____have come up4.I don't like something, whatever it may be,____I try it.A.until after B.ever since C.long before D.as soon as5._____the education reform,the teachers find themselves badly____further study.A.Being in;going in for B.Meeting;in time of C.Seeing;going on D.Facing;in need of

问10年北京英语高考一道单选题：（ ）they decide which……（高手进来看下~
（ ）they decide which college to go to,students should research the admission procedures.
选项：as 、while 、until 、once
给了50分,
为什么once就不对,从语法上为什么呀~
这道题考察的是什么
我错了,答案是once.请问,as为什么不行呢?译为：当他们决定去那所大学,就应该去了解录取程序?

请教英语单选题
21.This is _____ that I have ever seen.
a,a best movie
b,one of the best movie
c,one best movie
d,one of the best movies
请说出理由,

英语单选题
1.Have you got some brown eggs?No,but I've got ( ).
A.any white ones B.some white ones C.some white one D.any white one
2.( )child is pleased,for( )of them has got his own favorite toy.
A.Each;each B.Every; every C.Every;each D.Each;everyone
3.I'm sorry to tell you the train will be delayed.You have to wait ( ) two hours.
A.another B.other C.more D.more other

煤的干馏,上海十三校2012届高三第二次联考第四题单选题
根据下图所示把煤隔绝空气加强热,下列叙述正确的是
x05A．气体Z有还原性,可还原CuO,也可使溴水褪色
x05B．煤发生了复杂的物理变化
x05C．最后横玻璃管中固体物质消失
x05D．试管内液体X是粗氨水,Y是一种黑色黏稠状液体
答案是选A,为什么D不对
我认为AD都对啊,煤焦油怎么是淡黄色的?应该是就是黑色的吧?

某高校设计了一个实验学科的实验考查方案：考生从6道备选题中一次性随机抽取3题，按照题目要求独立完成全部实验操作．规定：至少正确完成其中2题的便可提交通过．已知6道备选题中考生甲有4道题能正确完成，2道题不能完成．
（1）求出甲考生正确完成题数的概率分布列，并计算数学期望；
（2）若考生乙每题正确完成的概率都是[2/3]，且每题正确完成与否互不影响．试从至少正确完成2题的概率分析比较两位考生的实验操作能力．

某学生参加一次世博志愿者测试,已知在备选的10道试题中,预计每道题该学生答对的概率为2/3。规定每位考生都从备选题中随机抽出3道题进行测试，则该学生仅答对2道题的概率是_____
答案是4/9，需要详细的解答过程，谢谢！